As you all know, any electronic device needs to be connected to a power source to function effectively. At least when we're talking about, for example, desktop computers, game consoles, etc. Portable devices usually run on batteries, while the former tend to be directly connected to the power supply. It's in this situation, especially in the PC world, where concepts such as Active PFC.
You've probably heard about this concept more than once, but you may have no idea what it is, what it's for, or whether it's really necessary. First of all, before I even get into the subject, I will tell you that yes, it is very necessary and it fulfills a very important function.Ultimately, it's what's responsible for processing and controlling the flow of electricity to improve energy efficiency and minimize energy losses.
What is active PFC?
That said, we can start by defining the concept of active PFC to give us a clearer idea of, redundantly, what it is. Right off the bat, we can say that it is the acronym for Power Factor CorrectionIn Spanish, it would be Power Factor Correction, a term that already says a lot about itself and its definition.
To this we can add the fact that it is a very important technology in the world of power supplies, since it is primarily responsible for improve, ensure and safeguard its energy efficiencyThat is, it focuses on reducing energy losses when converting that same energy. Let's remember, then, that when the power supply sends energy to the PC, it is transformed from alternating current to direct current.
With this in mind, we can say that the active PFC is a correction system that deals with adjusting, controlling and regulate the shape of the waveform of the electric power current that is drawn from any network to match the voltage waveform of the network and the computer. This improves its performance and ensures it works properly. Of course, it's not the only element involved in the process.
You might be interested
- Best Power Supplies: Complete Model Guide and Tips for Choosing the Right PSU for Your PC
- How does a power supply work?
- The best cheap power supplies
- How to choose a power supply unit (PSU) for your PC
- What power supply do I need for each graphics card?
- How to test a power supply and diagnose the problem
What is power factor and why is it important?
However, to understand both the concept of FPC and its importance, as well as how it works, it is important to talk about the so-called Power factor o FPThis term, applied not only to power supplies but to a wide variety of electrical systems, is a measure of power. This is used, as you might have guessed, with electrical energy. Therefore, we can say that it's an element that can be defined by values.
Commonly, The ideal power factor is said to be 1, since this value indicates that all the electrical energy being taken from the original source is being used appropriately and efficiently. In other words, neither too much nor too little is being taken. However, this isn't always the case, since many devices (especially those that run on alternating current) can have a value lower than 1. Why? Because the way these devices connect to the grid and use energy may not be entirely synchronized. This leads to energy losses in the form of heat.
This, in many cases, leads to problems. Traditional power supplies, especially those without active PFC, can have a low power factor. When the current and voltage are not synchronized, Energy is lost in the form of heat during the conversion from alternating current to direct currentThis loss not only increases electricity consumption, but can also affect the stability and efficiency of electronic devices.
So, by understanding the concept of FP, and adding what we already know about active PFCs, we can understand why they're important. At least at first glance. With an active system, we can avoid these irregularities, ensuring that everything runs more smoothly and that there are fewer errors.
What is it for
In short, we can say that it serves to:
- Input power monitoringThe active PFC constantly monitors the input voltage of the electrical current coming from the grid. This voltage can vary due to fluctuations in the electrical grid.
- Precision controlThe electronic circuits within the active PFC adjust the way current is drawn from the mains. These circuits control the phase and amplitude of the current so that they are in phase with the voltage, meaning energy is used more efficiently.
- Optimized in waveformBy adjusting the current waveform to be in phase with the input voltage, energy losses are minimized. This results in more efficient use of electricity, as most of the supplied energy is converted into useful work rather than dissipated as heat.
- Reduction of reactive currentsActive PFC reduces the amount of reactive current, which is current that doesn't perform useful work and can cause energy losses in the form of heat. By minimizing reactive current, the power factor is improved.
- Greater efficiencyBy improving the power factor, active PFC has several advantages. It enables more efficient use of electrical energy, reduces heat losses during energy conversion, and contributes to electrical system stability by reducing current fluctuations.
- Greater stability. By reducing current fluctuations and improving energy conversion efficiency, active PFC helps maintain the stability of the electrical system to which it is connected.
What is passive PFC and how does it differ from active PFC?
If there's an active PFC, does that mean there's also a passive one? The answer is yes. In this case, we can also say it's a system to improve the PFC. That is, which is a system assigned to Power Factor Correction, although it's much simpler. It generally also corrects for power differences, but less accurately, allowing for energy losses in the form of heat. It's more common in mobile phones, so it's not as common in computers.
This makes a lot of sense considering that, in contrast, active PFC uses a much more complex system and components capable of feedback to effectively control the electrical current. Using various techniques, dynamically adjusts the current to increase or decrease the energy flow depending on the situation. The passive mode is not modulated, so it's always the same.
The good thing is that most contemporary power supplies designed for PCs and with a minimum power requirement incorporate an active PFC system., so it won't be necessary to invest in it. Most are very close to that ideal value of 1, although there are better and worse ones, of course.
What is a power supply
A power supply is an electronic device that converts electrical current from a source, such as a mains power outlet, into a form of energy that an electrical or electronic device can usePower supplies are essential for the operation of most electronic devices, including computers, cell phones, televisions, and other household appliances.
Essentially, a power supply takes incoming electrical power and transforms it into direct current (DC) or alternating current (AC) output, depending on the needs of the device being powered. These power supplies can be internal, built into the electronic device, or external, connected to the device via a cable.
In the context of computers and other electronic devices, power supplies also typically include components to regulate voltage and current, which is where the concept of PFC comes in. This ensures that the device receives a constant and stable electrical current for proper operation.